208069faf183dd46622f0f6789ab6992bb07ccce
[platform/kernel/linux-starfive.git] / drivers / gpu / drm / imx / imx-ldb.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * i.MX drm driver - LVDS display bridge
4  *
5  * Copyright (C) 2012 Sascha Hauer, Pengutronix
6  */
7
8 #include <linux/clk.h>
9 #include <linux/component.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
12 #include <linux/module.h>
13 #include <linux/of_device.h>
14 #include <linux/of_graph.h>
15 #include <linux/regmap.h>
16 #include <linux/videodev2.h>
17
18 #include <video/of_display_timing.h>
19 #include <video/of_videomode.h>
20
21 #include <drm/drm_atomic.h>
22 #include <drm/drm_atomic_helper.h>
23 #include <drm/drm_bridge.h>
24 #include <drm/drm_fb_helper.h>
25 #include <drm/drm_of.h>
26 #include <drm/drm_panel.h>
27 #include <drm/drm_print.h>
28 #include <drm/drm_probe_helper.h>
29
30 #include "imx-drm.h"
31
32 #define DRIVER_NAME "imx-ldb"
33
34 #define LDB_CH0_MODE_EN_TO_DI0          (1 << 0)
35 #define LDB_CH0_MODE_EN_TO_DI1          (3 << 0)
36 #define LDB_CH0_MODE_EN_MASK            (3 << 0)
37 #define LDB_CH1_MODE_EN_TO_DI0          (1 << 2)
38 #define LDB_CH1_MODE_EN_TO_DI1          (3 << 2)
39 #define LDB_CH1_MODE_EN_MASK            (3 << 2)
40 #define LDB_SPLIT_MODE_EN               (1 << 4)
41 #define LDB_DATA_WIDTH_CH0_24           (1 << 5)
42 #define LDB_BIT_MAP_CH0_JEIDA           (1 << 6)
43 #define LDB_DATA_WIDTH_CH1_24           (1 << 7)
44 #define LDB_BIT_MAP_CH1_JEIDA           (1 << 8)
45 #define LDB_DI0_VS_POL_ACT_LOW          (1 << 9)
46 #define LDB_DI1_VS_POL_ACT_LOW          (1 << 10)
47 #define LDB_BGREF_RMODE_INT             (1 << 15)
48
49 struct imx_ldb;
50
51 struct imx_ldb_channel {
52         struct imx_ldb *ldb;
53         struct drm_connector connector;
54         struct drm_encoder encoder;
55
56         /* Defines what is connected to the ldb, only one at a time */
57         struct drm_panel *panel;
58         struct drm_bridge *bridge;
59
60         struct device_node *child;
61         struct i2c_adapter *ddc;
62         int chno;
63         void *edid;
64         int edid_len;
65         struct drm_display_mode mode;
66         int mode_valid;
67         u32 bus_format;
68         u32 bus_flags;
69 };
70
71 static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c)
72 {
73         return container_of(c, struct imx_ldb_channel, connector);
74 }
75
76 static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e)
77 {
78         return container_of(e, struct imx_ldb_channel, encoder);
79 }
80
81 struct bus_mux {
82         int reg;
83         int shift;
84         int mask;
85 };
86
87 struct imx_ldb {
88         struct regmap *regmap;
89         struct device *dev;
90         struct imx_ldb_channel channel[2];
91         struct clk *clk[2]; /* our own clock */
92         struct clk *clk_sel[4]; /* parent of display clock */
93         struct clk *clk_parent[4]; /* original parent of clk_sel */
94         struct clk *clk_pll[2]; /* upstream clock we can adjust */
95         u32 ldb_ctrl;
96         const struct bus_mux *lvds_mux;
97 };
98
99 static void imx_ldb_ch_set_bus_format(struct imx_ldb_channel *imx_ldb_ch,
100                                       u32 bus_format)
101 {
102         struct imx_ldb *ldb = imx_ldb_ch->ldb;
103         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
104
105         switch (bus_format) {
106         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
107                 break;
108         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
109                 if (imx_ldb_ch->chno == 0 || dual)
110                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
111                 if (imx_ldb_ch->chno == 1 || dual)
112                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
113                 break;
114         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
115                 if (imx_ldb_ch->chno == 0 || dual)
116                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
117                                          LDB_BIT_MAP_CH0_JEIDA;
118                 if (imx_ldb_ch->chno == 1 || dual)
119                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
120                                          LDB_BIT_MAP_CH1_JEIDA;
121                 break;
122         }
123 }
124
125 static int imx_ldb_connector_get_modes(struct drm_connector *connector)
126 {
127         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
128         int num_modes;
129
130         num_modes = drm_panel_get_modes(imx_ldb_ch->panel);
131         if (num_modes > 0)
132                 return num_modes;
133
134         if (!imx_ldb_ch->edid && imx_ldb_ch->ddc)
135                 imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc);
136
137         if (imx_ldb_ch->edid) {
138                 drm_connector_update_edid_property(connector,
139                                                         imx_ldb_ch->edid);
140                 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
141         }
142
143         if (imx_ldb_ch->mode_valid) {
144                 struct drm_display_mode *mode;
145
146                 mode = drm_mode_create(connector->dev);
147                 if (!mode)
148                         return -EINVAL;
149                 drm_mode_copy(mode, &imx_ldb_ch->mode);
150                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
151                 drm_mode_probed_add(connector, mode);
152                 num_modes++;
153         }
154
155         return num_modes;
156 }
157
158 static struct drm_encoder *imx_ldb_connector_best_encoder(
159                 struct drm_connector *connector)
160 {
161         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
162
163         return &imx_ldb_ch->encoder;
164 }
165
166 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
167                 unsigned long serial_clk, unsigned long di_clk)
168 {
169         int ret;
170
171         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
172                         clk_get_rate(ldb->clk_pll[chno]), serial_clk);
173         clk_set_rate(ldb->clk_pll[chno], serial_clk);
174
175         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
176                         clk_get_rate(ldb->clk_pll[chno]));
177
178         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
179                         clk_get_rate(ldb->clk[chno]),
180                         (long int)di_clk);
181         clk_set_rate(ldb->clk[chno], di_clk);
182
183         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
184                         clk_get_rate(ldb->clk[chno]));
185
186         /* set display clock mux to LDB input clock */
187         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
188         if (ret)
189                 dev_err(ldb->dev,
190                         "unable to set di%d parent clock to ldb_di%d\n", mux,
191                         chno);
192 }
193
194 static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
195 {
196         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
197         struct imx_ldb *ldb = imx_ldb_ch->ldb;
198         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
199         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
200
201         drm_panel_prepare(imx_ldb_ch->panel);
202
203         if (dual) {
204                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[0]);
205                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[1]);
206
207                 clk_prepare_enable(ldb->clk[0]);
208                 clk_prepare_enable(ldb->clk[1]);
209         } else {
210                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]);
211         }
212
213         if (imx_ldb_ch == &ldb->channel[0] || dual) {
214                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
215                 if (mux == 0 || ldb->lvds_mux)
216                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
217                 else if (mux == 1)
218                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
219         }
220         if (imx_ldb_ch == &ldb->channel[1] || dual) {
221                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
222                 if (mux == 1 || ldb->lvds_mux)
223                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
224                 else if (mux == 0)
225                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
226         }
227
228         if (ldb->lvds_mux) {
229                 const struct bus_mux *lvds_mux = NULL;
230
231                 if (imx_ldb_ch == &ldb->channel[0])
232                         lvds_mux = &ldb->lvds_mux[0];
233                 else if (imx_ldb_ch == &ldb->channel[1])
234                         lvds_mux = &ldb->lvds_mux[1];
235
236                 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
237                                    mux << lvds_mux->shift);
238         }
239
240         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
241
242         drm_panel_enable(imx_ldb_ch->panel);
243 }
244
245 static void
246 imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
247                                 struct drm_crtc_state *crtc_state,
248                                 struct drm_connector_state *connector_state)
249 {
250         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
251         struct drm_display_mode *mode = &crtc_state->adjusted_mode;
252         struct imx_ldb *ldb = imx_ldb_ch->ldb;
253         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
254         unsigned long serial_clk;
255         unsigned long di_clk = mode->clock * 1000;
256         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
257         u32 bus_format = imx_ldb_ch->bus_format;
258
259         if (mode->clock > 170000) {
260                 dev_warn(ldb->dev,
261                          "%s: mode exceeds 170 MHz pixel clock\n", __func__);
262         }
263         if (mode->clock > 85000 && !dual) {
264                 dev_warn(ldb->dev,
265                          "%s: mode exceeds 85 MHz pixel clock\n", __func__);
266         }
267
268         if (dual) {
269                 serial_clk = 3500UL * mode->clock;
270                 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
271                 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
272         } else {
273                 serial_clk = 7000UL * mode->clock;
274                 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
275                                   di_clk);
276         }
277
278         /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
279         if (imx_ldb_ch == &ldb->channel[0] || dual) {
280                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
281                         ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
282                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
283                         ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
284         }
285         if (imx_ldb_ch == &ldb->channel[1] || dual) {
286                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
287                         ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
288                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
289                         ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
290         }
291
292         if (!bus_format) {
293                 struct drm_connector *connector = connector_state->connector;
294                 struct drm_display_info *di = &connector->display_info;
295
296                 if (di->num_bus_formats)
297                         bus_format = di->bus_formats[0];
298         }
299         imx_ldb_ch_set_bus_format(imx_ldb_ch, bus_format);
300 }
301
302 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
303 {
304         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
305         struct imx_ldb *ldb = imx_ldb_ch->ldb;
306         int mux, ret;
307
308         drm_panel_disable(imx_ldb_ch->panel);
309
310         if (imx_ldb_ch == &ldb->channel[0])
311                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
312         else if (imx_ldb_ch == &ldb->channel[1])
313                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
314
315         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
316
317         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
318                 clk_disable_unprepare(ldb->clk[0]);
319                 clk_disable_unprepare(ldb->clk[1]);
320         }
321
322         if (ldb->lvds_mux) {
323                 const struct bus_mux *lvds_mux = NULL;
324
325                 if (imx_ldb_ch == &ldb->channel[0])
326                         lvds_mux = &ldb->lvds_mux[0];
327                 else if (imx_ldb_ch == &ldb->channel[1])
328                         lvds_mux = &ldb->lvds_mux[1];
329
330                 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
331                 mux &= lvds_mux->mask;
332                 mux >>= lvds_mux->shift;
333         } else {
334                 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
335         }
336
337         /* set display clock mux back to original input clock */
338         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
339         if (ret)
340                 dev_err(ldb->dev,
341                         "unable to set di%d parent clock to original parent\n",
342                         mux);
343
344         drm_panel_unprepare(imx_ldb_ch->panel);
345 }
346
347 static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder,
348                                         struct drm_crtc_state *crtc_state,
349                                         struct drm_connector_state *conn_state)
350 {
351         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
352         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
353         struct drm_display_info *di = &conn_state->connector->display_info;
354         u32 bus_format = imx_ldb_ch->bus_format;
355
356         /* Bus format description in DT overrides connector display info. */
357         if (!bus_format && di->num_bus_formats) {
358                 bus_format = di->bus_formats[0];
359                 imx_crtc_state->bus_flags = di->bus_flags;
360         } else {
361                 bus_format = imx_ldb_ch->bus_format;
362                 imx_crtc_state->bus_flags = imx_ldb_ch->bus_flags;
363         }
364         switch (bus_format) {
365         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
366                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
367                 break;
368         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
369         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
370                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
371                 break;
372         default:
373                 return -EINVAL;
374         }
375
376         imx_crtc_state->di_hsync_pin = 2;
377         imx_crtc_state->di_vsync_pin = 3;
378
379         return 0;
380 }
381
382
383 static const struct drm_connector_funcs imx_ldb_connector_funcs = {
384         .fill_modes = drm_helper_probe_single_connector_modes,
385         .destroy = imx_drm_connector_destroy,
386         .reset = drm_atomic_helper_connector_reset,
387         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
388         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
389 };
390
391 static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
392         .get_modes = imx_ldb_connector_get_modes,
393         .best_encoder = imx_ldb_connector_best_encoder,
394 };
395
396 static const struct drm_encoder_funcs imx_ldb_encoder_funcs = {
397         .destroy = imx_drm_encoder_destroy,
398 };
399
400 static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
401         .atomic_mode_set = imx_ldb_encoder_atomic_mode_set,
402         .enable = imx_ldb_encoder_enable,
403         .disable = imx_ldb_encoder_disable,
404         .atomic_check = imx_ldb_encoder_atomic_check,
405 };
406
407 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
408 {
409         char clkname[16];
410
411         snprintf(clkname, sizeof(clkname), "di%d", chno);
412         ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
413         if (IS_ERR(ldb->clk[chno]))
414                 return PTR_ERR(ldb->clk[chno]);
415
416         snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
417         ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
418
419         return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
420 }
421
422 static int imx_ldb_register(struct drm_device *drm,
423         struct imx_ldb_channel *imx_ldb_ch)
424 {
425         struct imx_ldb *ldb = imx_ldb_ch->ldb;
426         struct drm_encoder *encoder = &imx_ldb_ch->encoder;
427         int ret;
428
429         ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
430         if (ret)
431                 return ret;
432
433         ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
434         if (ret)
435                 return ret;
436
437         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
438                 ret = imx_ldb_get_clk(ldb, 1);
439                 if (ret)
440                         return ret;
441         }
442
443         drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
444         drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs,
445                          DRM_MODE_ENCODER_LVDS, NULL);
446
447         if (imx_ldb_ch->bridge) {
448                 ret = drm_bridge_attach(&imx_ldb_ch->encoder,
449                                         imx_ldb_ch->bridge, NULL);
450                 if (ret) {
451                         DRM_ERROR("Failed to initialize bridge with drm\n");
452                         return ret;
453                 }
454         } else {
455                 /*
456                  * We want to add the connector whenever there is no bridge
457                  * that brings its own, not only when there is a panel. For
458                  * historical reasons, the ldb driver can also work without
459                  * a panel.
460                  */
461                 drm_connector_helper_add(&imx_ldb_ch->connector,
462                                 &imx_ldb_connector_helper_funcs);
463                 drm_connector_init_with_ddc(drm, &imx_ldb_ch->connector,
464                                             &imx_ldb_connector_funcs,
465                                             DRM_MODE_CONNECTOR_LVDS,
466                                             imx_ldb_ch->ddc);
467                 drm_connector_attach_encoder(&imx_ldb_ch->connector, encoder);
468         }
469
470         if (imx_ldb_ch->panel) {
471                 ret = drm_panel_attach(imx_ldb_ch->panel,
472                                        &imx_ldb_ch->connector);
473                 if (ret)
474                         return ret;
475         }
476
477         return 0;
478 }
479
480 enum {
481         LVDS_BIT_MAP_SPWG,
482         LVDS_BIT_MAP_JEIDA
483 };
484
485 struct imx_ldb_bit_mapping {
486         u32 bus_format;
487         u32 datawidth;
488         const char * const mapping;
489 };
490
491 static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
492         { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,  18, "spwg" },
493         { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,  24, "spwg" },
494         { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
495 };
496
497 static u32 of_get_bus_format(struct device *dev, struct device_node *np)
498 {
499         const char *bm;
500         u32 datawidth = 0;
501         int ret, i;
502
503         ret = of_property_read_string(np, "fsl,data-mapping", &bm);
504         if (ret < 0)
505                 return ret;
506
507         of_property_read_u32(np, "fsl,data-width", &datawidth);
508
509         for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
510                 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
511                     datawidth == imx_ldb_bit_mappings[i].datawidth)
512                         return imx_ldb_bit_mappings[i].bus_format;
513         }
514
515         dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
516
517         return -ENOENT;
518 }
519
520 static struct bus_mux imx6q_lvds_mux[2] = {
521         {
522                 .reg = IOMUXC_GPR3,
523                 .shift = 6,
524                 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
525         }, {
526                 .reg = IOMUXC_GPR3,
527                 .shift = 8,
528                 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
529         }
530 };
531
532 /*
533  * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
534  * of_match_device will walk through this list and take the first entry
535  * matching any of its compatible values. Therefore, the more generic
536  * entries (in this case fsl,imx53-ldb) need to be ordered last.
537  */
538 static const struct of_device_id imx_ldb_dt_ids[] = {
539         { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
540         { .compatible = "fsl,imx53-ldb", .data = NULL, },
541         { }
542 };
543 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
544
545 static int imx_ldb_panel_ddc(struct device *dev,
546                 struct imx_ldb_channel *channel, struct device_node *child)
547 {
548         struct device_node *ddc_node;
549         const u8 *edidp;
550         int ret;
551
552         ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
553         if (ddc_node) {
554                 channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
555                 of_node_put(ddc_node);
556                 if (!channel->ddc) {
557                         dev_warn(dev, "failed to get ddc i2c adapter\n");
558                         return -EPROBE_DEFER;
559                 }
560         }
561
562         if (!channel->ddc) {
563                 /* if no DDC available, fallback to hardcoded EDID */
564                 dev_dbg(dev, "no ddc available\n");
565
566                 edidp = of_get_property(child, "edid",
567                                         &channel->edid_len);
568                 if (edidp) {
569                         channel->edid = kmemdup(edidp,
570                                                 channel->edid_len,
571                                                 GFP_KERNEL);
572                 } else if (!channel->panel) {
573                         /* fallback to display-timings node */
574                         ret = of_get_drm_display_mode(child,
575                                                       &channel->mode,
576                                                       &channel->bus_flags,
577                                                       OF_USE_NATIVE_MODE);
578                         if (!ret)
579                                 channel->mode_valid = 1;
580                 }
581         }
582         return 0;
583 }
584
585 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
586 {
587         struct drm_device *drm = data;
588         struct device_node *np = dev->of_node;
589         const struct of_device_id *of_id =
590                         of_match_device(imx_ldb_dt_ids, dev);
591         struct device_node *child;
592         struct imx_ldb *imx_ldb;
593         int dual;
594         int ret;
595         int i;
596
597         imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
598         if (!imx_ldb)
599                 return -ENOMEM;
600
601         imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
602         if (IS_ERR(imx_ldb->regmap)) {
603                 dev_err(dev, "failed to get parent regmap\n");
604                 return PTR_ERR(imx_ldb->regmap);
605         }
606
607         /* disable LDB by resetting the control register to POR default */
608         regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0);
609
610         imx_ldb->dev = dev;
611
612         if (of_id)
613                 imx_ldb->lvds_mux = of_id->data;
614
615         dual = of_property_read_bool(np, "fsl,dual-channel");
616         if (dual)
617                 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
618
619         /*
620          * There are three different possible clock mux configurations:
621          * i.MX53:  ipu1_di0_sel, ipu1_di1_sel
622          * i.MX6q:  ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
623          * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
624          * Map them all to di0_sel...di3_sel.
625          */
626         for (i = 0; i < 4; i++) {
627                 char clkname[16];
628
629                 sprintf(clkname, "di%d_sel", i);
630                 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
631                 if (IS_ERR(imx_ldb->clk_sel[i])) {
632                         ret = PTR_ERR(imx_ldb->clk_sel[i]);
633                         imx_ldb->clk_sel[i] = NULL;
634                         break;
635                 }
636
637                 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
638         }
639         if (i == 0)
640                 return ret;
641
642         for_each_child_of_node(np, child) {
643                 struct imx_ldb_channel *channel;
644                 int bus_format;
645
646                 ret = of_property_read_u32(child, "reg", &i);
647                 if (ret || i < 0 || i > 1) {
648                         ret = -EINVAL;
649                         goto free_child;
650                 }
651
652                 if (!of_device_is_available(child))
653                         continue;
654
655                 if (dual && i > 0) {
656                         dev_warn(dev, "dual-channel mode, ignoring second output\n");
657                         continue;
658                 }
659
660                 channel = &imx_ldb->channel[i];
661                 channel->ldb = imx_ldb;
662                 channel->chno = i;
663
664                 /*
665                  * The output port is port@4 with an external 4-port mux or
666                  * port@2 with the internal 2-port mux.
667                  */
668                 ret = drm_of_find_panel_or_bridge(child,
669                                                   imx_ldb->lvds_mux ? 4 : 2, 0,
670                                                   &channel->panel, &channel->bridge);
671                 if (ret && ret != -ENODEV)
672                         goto free_child;
673
674                 /* panel ddc only if there is no bridge */
675                 if (!channel->bridge) {
676                         ret = imx_ldb_panel_ddc(dev, channel, child);
677                         if (ret)
678                                 goto free_child;
679                 }
680
681                 bus_format = of_get_bus_format(dev, child);
682                 if (bus_format == -EINVAL) {
683                         /*
684                          * If no bus format was specified in the device tree,
685                          * we can still get it from the connected panel later.
686                          */
687                         if (channel->panel && channel->panel->funcs &&
688                             channel->panel->funcs->get_modes)
689                                 bus_format = 0;
690                 }
691                 if (bus_format < 0) {
692                         dev_err(dev, "could not determine data mapping: %d\n",
693                                 bus_format);
694                         ret = bus_format;
695                         goto free_child;
696                 }
697                 channel->bus_format = bus_format;
698                 channel->child = child;
699
700                 ret = imx_ldb_register(drm, channel);
701                 if (ret) {
702                         channel->child = NULL;
703                         goto free_child;
704                 }
705         }
706
707         dev_set_drvdata(dev, imx_ldb);
708
709         return 0;
710
711 free_child:
712         of_node_put(child);
713         return ret;
714 }
715
716 static void imx_ldb_unbind(struct device *dev, struct device *master,
717         void *data)
718 {
719         struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
720         int i;
721
722         for (i = 0; i < 2; i++) {
723                 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
724
725                 if (channel->panel)
726                         drm_panel_detach(channel->panel);
727
728                 kfree(channel->edid);
729                 i2c_put_adapter(channel->ddc);
730         }
731 }
732
733 static const struct component_ops imx_ldb_ops = {
734         .bind   = imx_ldb_bind,
735         .unbind = imx_ldb_unbind,
736 };
737
738 static int imx_ldb_probe(struct platform_device *pdev)
739 {
740         return component_add(&pdev->dev, &imx_ldb_ops);
741 }
742
743 static int imx_ldb_remove(struct platform_device *pdev)
744 {
745         component_del(&pdev->dev, &imx_ldb_ops);
746         return 0;
747 }
748
749 static struct platform_driver imx_ldb_driver = {
750         .probe          = imx_ldb_probe,
751         .remove         = imx_ldb_remove,
752         .driver         = {
753                 .of_match_table = imx_ldb_dt_ids,
754                 .name   = DRIVER_NAME,
755         },
756 };
757
758 module_platform_driver(imx_ldb_driver);
759
760 MODULE_DESCRIPTION("i.MX LVDS driver");
761 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
762 MODULE_LICENSE("GPL");
763 MODULE_ALIAS("platform:" DRIVER_NAME);